There should be, but it will have to be a separate, non-included test (for now) because background-clip: text is not a real value in the CSS Borders & Backgrounds spec (as of CR/15Feb2011).

Theoretically, what this test would do is the same as the regular background-clip test, but set explicitly with a value of "text", and then do a boolean verify that the return value still contains "text". Won’t be as fast as the standards-based background-clip test though.

Thanks for the help, all. Would you please verify the test below? In addition, I'm much, much stronger on the CSS end than JS, so I'd appreciate a kind smack upside the head if there's a better way to do this. :)